まとめ
珍しい海底山は,深海の上部マントル岩を明らかにし,2km以上上昇しています. この地質学的な特徴は,マントルの上流と断層地帯に沿った地質学的な活動の結果である.
科学分野:
- * 海洋地質学
- * ペトロロジー・ペトロロジー
- * テキトニクス
背景:
- *オーウェン断層地帯とミッド・インディアン・リッジの交差点の近くの異常な地形学的な高さは,超質量岩石を暴露しています.
- *これらの岩石は,蛇形化したスピネル・ヘルゾライト,ハーツブルギット,ダニットを含むが,累積した質感がない.
研究 の 目的:
- *海洋上層マントルの露出ブロックの起源と上昇メカニズムを調査する.
- * トポグラフィの高さから超マフィック岩のペトロロジーと鉱物化学を分析する.
主な方法:
- * トポグラフィック・ハイのフィールド観測.
- * ウルトラマフィックの岩石サンプルの質感分析.
- *オリヴィン,ピロキセン,スピネル結晶の鉱物化学分析.
主要な成果:
- * ウルトラマフィックの岩は,海洋の石層の少なくとも25kmの深さで発生した.
- * アップウェリング中の部分的な再均衡と再結晶の証拠が観察されました.
- *データは,典型的な海洋地殻の断面ではなく,上層マントルの上昇したブロックを示しています.
結論:
- * 露出した超大質量岩は,海洋上のマントルの重要なブロックを表しています.
- *マントルの上流と断層地帯の構造的上昇を含む2段階のプロセスが,実質的な垂直の移転を説明しています.
- * 骨折地帯に沿った上昇率は,年間約1ミリメートルと推定されています.
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